Abstract
A hybrid analysis of a continuous-wave terahertz photomixer source structure with plasmonic nano-grating electrodes is presented. Using the hybrid analysis, the enhancement of the optical power absorption due to the presence of the one-dimensional metallic nano-grating is investigated by defining an absorption enhancement factor. We show that the proposed absorption enhancement factor can be used as a design tool, whose maximization provides the optimum geometrical parameters of the nano-grating. Based on drift-diffusion model, the photocurrent enhancement due to the nano-grating electrodes is studied under three different bias configurations. Moreover, the dependence of the photocurrent on the physical parameters of the photomixer is analyzed.
Highlights
Optical properties of one-dimensional (1-D) nanoscale metallic grating and some interesting phenomena, such as the extraordinary optical transmission (EOT) introduced by Ebbesen et al [1] have been studied in numerous works over the last decade
FP resonances are calculated from the analysis presented in [19], which is a semi-analytical approach based on the method of moment and the expansion of the field inside the slit
Our analysis in this paper shows that by using nano-grating electrodes the optical absorption can be enhanced by a factor of around 1.4 at the optical resonances that eliminate the light reflection from the substrate
Summary
Optical properties of one-dimensional (1-D) nanoscale metallic grating and some interesting phenomena, such as the extraordinary optical transmission (EOT) introduced by Ebbesen et al [1] have been studied in numerous works over the last decade. Despite considerable number of experimental efforts that have been made to incorporate metallic nano-gratings in photomixers, accurate analytical model of such photomixers that incorporate all the physical phenomena involved are far less developed Different aspects such as optical grating and current manipulation by bias electrodes need to be considered in an accurate modeling. The purpose of this paper is to apply a hybrid numerical approach for designing a metallic nano-grating using it as the bias electrodes of a THz photomixer source to enhance photocurrent generation. In the first step, scattering of two laser beams, with difference frequency at terahertz range, from the metallic nano-grating on the photo-conductor substrate is analyzed.
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